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sony-laptop: fix SNC buffer calls when SN06 returns Integers 

SN06 in some cases returns an Integer instead of a buffer. While the
code handling the return value was trying to cope with the difference,
the memcpy call was not making any difference between the two types of
acpi_object union. This regression was introduced in 3.5.
While there also rework the return value logic to improve readability.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=48671
Cc: <stable@vger.kernel.org>
Cc: Fabrizio Narni <shibotto@gmail.com>
Cc: <mus.svz@gmail.com>
Signed-off-by: Mattia Dongili <malattia@linux.it>
Signed-off-by: Matthew Garrett <matthew.garrett@nebula.com>
This commit is contained in:
Mattia Dongili 2012-12-21 07:21:09 +09:00 committed by Matthew Garrett
parent e04c200f1f
commit dcbeec264d
1 changed files with 8 additions and 7 deletions
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15
drivers/platform/x86/sony-laptop.c
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@ -786,28 +786,29 @@ static int sony_nc_int_call(acpi_handle handle, char *name, int *value,
static int sony_nc_buffer_call(acpi_handle handle, char *name, u64 *value,
void *buffer, size_t buflen)
{
int ret = 0;
size_t len = len;
union acpi_object *object = __call_snc_method(handle, name, value);
if (!object)
return -EINVAL;
if (object->type == ACPI_TYPE_BUFFER)
if (object->type == ACPI_TYPE_BUFFER) {
len = MIN(buflen, object->buffer.length);
memcpy(buffer, object->buffer.pointer, len);
else if (object->type == ACPI_TYPE_INTEGER)
} else if (object->type == ACPI_TYPE_INTEGER) {
len = MIN(buflen, sizeof(object->integer.value));
memcpy(buffer, &object->integer.value, len);
else {
} else {
pr_warn("Invalid acpi_object: expected 0x%x got 0x%x\n",
ACPI_TYPE_BUFFER, object->type);
kfree(object);
return -EINVAL;
ret = -EINVAL;
}
memcpy(buffer, object->buffer.pointer, len);
kfree(object);
return 0;
return ret;
}
struct sony_nc_handles {